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MM120

Phase 2

ADHD | Small molecule | Psychiatry |Definium Therapeutics, Inc.|Last Updated: Feb 27, 2026

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials1
Total Enrollment53

FDA Designations

BREAKTHROUGH_THERAPY

Clinical trial landscape

MM120 · 2 trials · 3 indications

Phase 2 2
NCT05407064A Dose-Finding Study of MM120 (LSD D-Tartrate) for the Treatment of Anxiety SymptomsAnxiety Generalized
COMPLETED198 Analytics
NCT05200936Safety and Efficacy of Low Dose MM120 for ADHD Proof of Concept TrialADHD
COMPLETED53 Analytics
PHASE2COMPLETED
A Dose-Finding Study of MM120 (LSD D-Tartrate) for the Treatment of Anxiety Symptoms
Anxiety GeneralizedUnlock trial analytics
PHASE2COMPLETED
Safety and Efficacy of Low Dose MM120 for ADHD Proof of Concept Trial
ADHDUnlock trial analytics

Study Endpoints

Primary Endpoints

Dose Response
4 weeks

To investigate the dose-response relationship for different doses of MM120 versus placebo in change from Baseline in Hamilton Anxiety Rating Scale (HAM-A) Total Score at Week 4. The HAM-A consists of the following 14 items that encompass both psychological and somatic symptoms of anxiety: Anxious mood, Tension, Fears, Insomnia, Intellectual, Depressed mood, Somatic (muscular), Somatic (sensory), Cardiovascular symptoms, Respiratory symptoms, Gastrointestinal symptoms, Genitourinary symptoms, Autonomic symptoms, and Behavior at interview (general). The central rater assessed the extent to which the subject displayed each given criterion and gave a rating on a scale of 0-4, where 4 represents the most severe symptoms. Minimum score = 0, maximum score = 56. Scores are summed and the greater the total score, the more severe illness.

Change in Adult Attention-Deficit/Hyperactivity Disorder (ADHD) Symptoms
6 weeks

The Adult ADHD investigator symptom rating scale (AISRS) total score consists of 18 items from the original Attention-deficit/hyperactivity Disorder Rating Scale (ADHD-RS). The ADHD-RS includes 9 items that address symptoms of inattention, and 9 items that address symptoms of impulsivity and hyperactivity. Each item is rated from 0 to 3. The AISRS total score can range from 0 to 54. A higher score corresponds to a worse severity of ADHD.

Secondary Endpoints

Dose Response
8 weeks
Change From Baseline in HAM-A Total Score
4 weeks
Change From Baseline in HAM-A Total Scores
8 weeks
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Arm 1- PlaceboPLACEBO_COMPARATORA substance that is designed to have no therapeutic value.
Arm 2- 25 μg MM120EXPERIMENTALA psychoactive substance that mediates effects mainly through an agonist activity in the serotonin 2A receptor (5-HT2A).
Arm 3- 50 μg MM120EXPERIMENTALA psychoactive substance that mediates effects mainly through an agonist activity in the serotonin 2A receptor (5-HT2A).
Arm 4- 100 μg MM120EXPERIMENTALA psychoactive substance that mediates effects mainly through an agonist activity in the serotonin 2A receptor (5-HT2A).
Arm 5- 200 μg MM120EXPERIMENTALA psychoactive substance that mediates effects mainly through an agonist activity in the serotonin 2A receptor (5-HT2A).
Arm 2- MM120EXPERIMENTALA total of 26 patients will receive 20 μg of MM120 administered orally twice weekly for 6 weeks.

Interventions

NameTypeDescription
MM120DRUGA psychoactive substance that mediates effects mainly through an agonist activity in the serotonin 2A receptor (5-HT2A).
PlaceboOTHERA substance that is designed to have no therapeutic value.
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Eligibility Criteria

Age Range18 Years to 74 Years
SexALL
Healthy VolunteersNo
Study Sites22

Inclusion Criteria: * Bodyweight of ≥ 50 kg * Body mass index \[BMI\] ≥ 18 to ≤ 38 mg/kg2 * Diagnosis of DSM-5 generalized anxiety disorder * Acceptable overall medical condition to be safely enrolled into and to complete the study * Ability to swallow capsules * Ability to provide informed consent...

Countries:United StatesNetherlandsSwitzerland
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Competitive Landscape -ADHD 3 trials

CompanyTickerTrialsLead PhaseDrugs
Supernus Pharmaceuticals, Inc.SUPN1PHASE3SPN-812
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Frequently asked questions about MM120

What is MM120 used for?

MM120 is an investigational small molecule being developed by Definium Therapeutics, Inc. for the treatment of ADHD and Generalized Anxiety Disorder. It is currently in Phase 2 clinical development and has received Breakthrough Therapy designation from the FDA.

What does MM120 target?

MM120 is a small molecule being studied for its effects on ADHD and Generalized Anxiety Disorder. The specific molecular target of MM120 has not been disclosed in available information, so its precise mechanism of action is not publicly detailed.

Who makes MM120?

MM120 is being developed by Definium Therapeutics, Inc., a biopharmaceutical company. The company is publicly traded under the ticker symbol DFTX.

What phase is MM120 in?

MM120 is currently in Phase 2 clinical development. It has completed two Phase 2 trials, one for ADHD and one for Generalized Anxiety Disorder, and is not yet approved by the FDA.

What clinical trials is MM120 in?

MM120 has completed two Phase 2 trials. NCT05200936 studied low-dose MM120 for ADHD in 53 participants across the Netherlands and Switzerland. NCT05407064 was a dose-finding study for anxiety symptoms in 198 participants in the United States.

Is MM120 FDA approved?

MM120 is not FDA approved. It is an investigational drug currently in Phase 2 clinical development. It has received Breakthrough Therapy designation from the FDA, which is intended to expedite the development and review of drugs for serious conditions.